I look forward to seeing some of the results of your new experiments 
Restricting one’s palette, these days, seems like a good creative step away from “everything looks the same” that pervades over so many photographs that are displayed on the web these days.
Hmm, well, my knowledge (or what passes for same ) of history of art is intermittent at best. But I was thinking of cangiante (Cangiante - Wikipedia) which I discovered in the course of trying for the umpteenth time to actually make sense of the word “chiaroscurro” - Wikipedia provides a black and white photograph as an example of chiaroscurro, which really leaves me scratching my head wondering what the term means, as opposed to ???